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Finding the Fourth Proportional to 90,019.70, 135,114.34 and 45,678.28

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Solution

The fourth proportional to 90,019.70, 135,114.34 and 45,678.28 is: 68,560.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,019.70 : 135,114.34 = 45,678.28 : x
  2. Step 2: Convert to fraction form
    90,019.70/135,114.34 = 45,678.28/x
  3. Step 3: Cross multiply
    90,019.70x = 135,114.34 × 45,678.28
  4. Step 4: Simplify right side
    90,019.70x = 6,171,790,654.54
  5. Step 5: Solve for x
    x = 6,171,790,654.54/90,019.70
  6. Step 6: Final answer
    x = 68,560.44

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.